1. Department of Ophthalmology and Visual Sciences, University of Iowa, Iowa City, Iowa, United States
2. Stephen A. Wynn Institute for Vision Research, University of Iowa, Iowa City, Iowa, United States
3. Department of Electrical and Computer Engineering, University of Iowa, Iowa City, Iowa, United States
4. Iowa City VA Health Care System, Iowa City, Iowa, United States
5. Department of Biomedical Engineering, University of Iowa, Iowa City, Iowa, United States
6. Department of Ophthalmology and Visual Sciences, University of Michigan, Ann Arbor, Michigan, United States
7. Department of Molecular and Integrative Physiology, University of Michigan, Ann Arbor, Michigan, United States